/Engine/Source/Editor/KismetCompiler/Public/KismetCompiler.h
Searches the function graphs and ubergraph pages for any delegate proxies, which are then registered with the compiler context. If a "captured" variable is needed, then a new property will be added to the current class. In this context, a captured variable is any target actor that the delegate will be called on.
void RegisterClassDelegateProxiesFromBlueprint()